Is the only difference between this and all the other gift registries like http://wantsthis.com http://wantsthis.com http://wishpot.com http://wishpot.com etc.

Is the only difference between this and all the other gift registries like http://wantsthis.com http://wantsthis.com http://wishpot.com http://wishpot.com etc. that they handle payment/customer service? I'd be curious to see how things like returns and really odd items like "cash" are handled.